Armored cable



June`14, 1932. lE, J SCHNEDER 1,863,169

ARMORED CABLE Filed July 25, 1930 IN VEN TOR.

A TTORNEY nf preferably composed of cotton or similar Patented June 14, 1932 UNITED sTATEs PATENT OFFICE EDWIN J'. SCHNEIDER, 0F JAMAICA, NEW YORK V ARMORED CABLE Application led July 25, 1930. Serial N0. 470,626.

Ihis invention relates to armored cable, consisting of a plurality of insulated electric conductors arranged in a flexible armored casing; and the object of the invention is to provide an improved protective covering for the insulated conductors arranged within said armored casing, consisting of inner and outer, spirally wrapped, paper sheaths, formed from strip material, each strip being fashioned by folding a comparatively wide strip a number of times upon itself; a further object being to provide in conjunction with the inner strip or the sheath formed thereby, a strand arranged within the folds of the strip forming said sheath and being fibrous material, and serving to form a spiral ridge on the first sheath, in connection with whlch the outer sheath operates to frictionally retain the last named sheath in predetermined position on said conductors and said inner sheath; a further object being to provide a sheathing of the class described in which each of said paper strips are treated with a Water and fire-proof compound, prior to folding said strip upon itself so as to thoroughly saturate the entire material of said strip, and. preferably in using a compound which will permit the free unravelling of said strips from the conductors in making electrical connections; and with these and other objects in View, the invention consists in a cable of the class and for the purpose specified, which is simple in construction, ef-

y fcient in use, and which is constructed as hereinafter described and claimed. V

The invention is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in'which Fig. 1 is a plan view of a part of an armored cable, showing the conductors extending from one end thereof and indicating the arrangement of the sheating strips thereon.

Fig. 2 is a diagrammatic view illustrating the arrangement of the sheathing on the conductors.

Fig. 3 is a section on the line 3-3 of Fig. 1, omitting the larmored casing.

Fig. 4 is a sectional, detail view of one of the strips employed in the structure shown in Figs. 1 to 3 inclusive; and, y

Fig. 5 is a view similar to Fig. 4 showing a modification.

In the construction shown, I employ two electric conductors 10 and 11, each contained in a body of rubber 10a- 11a and a braided covering 10b-11b. formed are arranged in twisted relation, and mounted on saidconductors is an inner sheath or protective covering consisting of a strip l2, upon which is arranged another sheath or covering consisting of a strip 12a. Both of these strips are of multiple ply thickness and are formed from a comparatively wide strip, folded at the' points 13 and 14, to form three separate ply arranged one upon the other as seen in the strip 12 shown in detail in Fig. 4 of the drawing.

This strip differentiates from the strip 12a in the arrangement of a strand 15 longitudinally thereof, said strand being arranged Within the separate ply thereof. The strand yInatically illustrated the arrangement of the strips 124-12@ with respect to each other, and from this figure, it will be noted that the side edges of the strip 12 overlap to a slight degree in spirally winding the same upon the con- The conductors thus ductors as seen at 17. In winding the strip 12a upon the strip 12, it is arranged in such manner as to bring the central portion of the strip 12erl over the intersection of the side edges of the strip 12, as at 17, and adjacent side edges of the strip 12a overlap as seen at 18.

In the showing in Fig. 2 of the drawing, the section of the strips is shown in solid lines, which represents the thickness of the multiple ply of said strip in an exaggerated form, it being understood at this time, that the cross section in Fig. 4 of the drawing, as well as in Fig. 3 of the drawing is also enlarged and exaggerated, the material from which the strips 12 and 12a are formed being of very fine paper, and when wound on the conductors will form a relatively smooth covering.

In Fig. 5 of the drawing, I have shown a slight modification in the construction of the stri 12, wherein a strip 19 is employed. In fol ing the blank upon itself to form a multi le ply thickness in the strip 19, one side edge thereof is folded around a strand 20 similar to the strand 15, so as to definitely position the strand 20 with respect to the side edges of lsaid strip, it being desirable to locate the positioning of the strands 15-20 in the respective strips. In this connection, however, it will be apparent that in the construction shown in Fig. 4 of the drawing and in using a paper treated with a waterproof and ireproof compound, prior to foldino' it upon itself to form the number of ply thickness, the compound will aid in retaining the strand 15 in position, if properly guided into the strip in the process of folding the same.

By using a paper strip of the class specified, and treating it with the compound, a very desirable, protective sheath or covering is provided for the twisted conductors, especially in roviding a compound'treatment or saturating solution which will not have excessive adhesive properties, enabling each of the protective sheaths to be unravelled to expose the conductors, facilitating the coupling of said conductors with terminals'in making electrical installations. Y

A protective sheath made from strip material spirally wound in the manner described, produces a strong and durable protective covering for the conductors arranged within the armored casing 21 of the inished product, said casing being of the flexible type. In the iiexure of the complete cable, the protective sheaths 12-12a are capable of slight movement one upon the other without danger of exposing the conductors contained therein and without danger of rupturing either of the casings when subjected to normal flexure.

It will be understood that while I have shown certain details of construction for carrying my invention into eli'ect, that I am not necessarily limited to these details, and

various changes in and modifications of the construction herein shown and described, may be made within the scope of the appended claims without departing from the spirit of my invention or sacrilicing its advantages.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

l. In armored cable comprising a plurality of insulated conductors contained in an outer, flexible, metallic casing, a protector sheath or covering disposed between said conductors and said casing and consisting of inner and outer spirally wound coverings composed of saturated paper strips of multiple thickness, each strip being of the same width and wound in such manner that adjacent edges of each strip overlap, and the central portion of the outer strip being disposed over the adjacent overlapped ends of the inner strip to dispose said strips in overlapped relation with respect to each other throughout the length of the cable.

2. In armored cable comprising a plurality of insulated conductors contained in an outer, iexible, metallic casing, a protector sheath or covering disposed between said conductors and said casing and consisting of inner and outer spirally wound coverings composed of saturated paper strips of multiple thickness, each strip being wound in such manner as to overlap adjacent edges, and the central portion of the outer strip being disposed over the adjacent ends of the inner stri to dispose said strips in overlapped relation with respect to each other, and a strand contained within the boundaries of one of said strips and forming thereon a rib for keying the otherpstrip against movement with respect thereto.

3. The combination. with insulated, electric conductors of the class described, of a protector casing consisting of a comparatively wlde strip of paper, treated with a moisture and fire-proof compound, said strip being folded upon itself when treated, to form a strip of multiple ply, a strand arranged between at least two ply of said strip and said strip being spirally wound upon said conductors to envelop the same within the sheath or casing formed thereby, adjacent edges of said strip overlapping each other when wound on said conductors, and another protector casingin the form of a'multiple ply saturated paper strip, spirally wound upon the first named casing and overlapping the intersections of said first named strip.

4. The combination with insulated, electric conductors of the class described, of a pro l tween at least two ply of said strip and said strip being spil-ally wound u n saidV conductors to envelop the same wit in the sheath or casing formed thereby, ad'aeent edges of said strip overla ping eac other when wound on said conductors another protector casing in the form of a muti 1e ply saturated paper strip, spirally woun upon the first named casing and overlapping the intersections of said first named strip, and a iexible armored casing' arranged upon said last named casing.

In testimony that I claim the foregoing as my invention I have signed my name this 22nd day of July, 1930.

EDWIN J. SCHNEIDER. 

